Holstein-Itzehoe was a county that was formed from Schauenburg and Holstein by the division of Holstein between Gerhard and John in 1261.
Gerhard of Holstein-Itzehoe was the only regent. After his death in 1290 Holstein-Itzehoe was divided up between Gerhard's sons into the three counties of Holstein-Rendsburg, Holstein-Plön and Holstein-Pinneberg (the latter ruled in personal union with the County of Schauenburg, thus sometimes called Holstein and Schauenburg, or Holstein-Schauenburg, however Schauenburg was the name of the ruling dynasty in all the then Holsatian counties).
Rise and fall of the county
edit| Holstein | |||||||||||||||||||||||||||||||||
| Holstein-Kiel (1261–1390) | Holstein-Itzehoe (1261–1300) | ||||||||||||||||||||||||||||||||
| Holstein-Segeberg (1273-1308) | |||||||||||||||||||||||||||||||||
| Holstein-Plön (1300–1390) | Holstein-Rendsburg (1300–1459) | Holstein-Pinneberg (1300–1640) | |||||||||||||||||||||||||||||||
| Duchy of Holstein (from 1474) | |||||||||||||||||||||||||||||||||
| Imperial County of Rantzau (1650–1726) | |||||||||||||||||||||||||||||||||